Subsurface radiating dipole
First Claim
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1. A subsurface radiating systemcomprising:
- a dipole antenna having first and second radiating elements radiating into a subsurface medium having a dielectric constant substantially greater than unity;
each of said radiating elements having a conductive portion forming a portion of a cavity;
a transmission line having an inner conductor surrounded by an outer conductor electrically connected between said radiating elements, said outer conductor being connected to said first of said radiating elements and said inner conductor being connected to said second of said radiating elements; and
means comprising a solid dielectric within said cavity portion of each of said radiating elements for producing resonant loading of a free end of said first one of said dipole radiating elements and for providing structural reinforcement for said first and second radiating elements.
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Abstract
A system for in situ heating of oil shale by radiating electromagnetic wave energy from a dipole radiator positioned beneath an overburden in a body of oil shale. Radio frequency power is supplied from the surface through a transmission line to the radiator dipoles whose diameters are substantially greater than the spacing between the transmission line conductors. The dipole radiator is center fed by the transmission line through a reentrant choke structure substantially filled with a solid dielectric medium and concentric with one of said dipole elements.
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Citations
23 Claims
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1. A subsurface radiating system
comprising: -
a dipole antenna having first and second radiating elements radiating into a subsurface medium having a dielectric constant substantially greater than unity; each of said radiating elements having a conductive portion forming a portion of a cavity; a transmission line having an inner conductor surrounded by an outer conductor electrically connected between said radiating elements, said outer conductor being connected to said first of said radiating elements and said inner conductor being connected to said second of said radiating elements; and means comprising a solid dielectric within said cavity portion of each of said radiating elements for producing resonant loading of a free end of said first one of said dipole radiating elements and for providing structural reinforcement for said first and second radiating elements. - View Dependent Claims (2, 3, 4, 5)
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6. A subsurface radiator comprising:
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a dipole antenna consisting of first and second radiating elements; means for connecting a transmission line between said radiating elements; and means comprising a solid dielectric in each of said radiating elements, having a dielectric constant substantially greater than unity for providing a resonant load, coupled to a free end of said first one of said dipole radiating elements when said one of said radiating elements is radiating into a medium having a dielectric constant substantially greater than unity, said solid dielectric means providing structural reinforcement for each of said first and second radiating elements against radial forces produced in said medium. - View Dependent Claims (7, 8, 9)
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10. A subsurface radiating system comprising:
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an antenna having first and second radiating elements radiating into a subsurface medium having a dielectric constant substantially greater than unity; each of said radiating elements having a conductive portion forming a portion of a cavity; a transmission line connected to said elements; and means comprising a solid dielectric within said cavity portion of each of said radiating elements for providing a resonant load whose impedance is substantially greater than the input impedance to said antenna and which is coupled to a free end of said first one of said radiating elements, and for providing structural reinforcement for said first and second radiating elements. - View Dependent Claims (11, 12, 13)
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14. A subsurface radiator comprising:
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an antenna having first and second radiating elements; means for connecting a transmission line to said antenna; means in each of said radiating elements comprising a solid dielectric having a dielectric constant substantially greater than unity and providing a resonant load coupled to a free end of said first one of said radiating elements when said radiating elements are radiating into a medium having a delectric constant substantially greater than unity; said transmission line comprising an inner conductor surrounded by an outer conductor; and the space between the inner surface portion of said first one of said radiating elements and an outer surface of said outer conductor of said transmission line being substantially filled with said solid dielectric whose dielectric constant is greater than unity to form said resonant load means, the space between an inner surface portion of said second of said radiating elements and an outer surface of a conductor having a same diameter as said outer conductor, said conductor being electrically connected to said inner conductor and said second of said radiating elements and extending downwardly parallel to said second of said radiating elements, being substantially filled with said solid dielectric.
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15. A subsurface radiator comprising:
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a dipole antenna having first and second radiating elements; each of said radiating elements having a conductive portion forming a portion of a cavity, each cavity comprising a solid dielectric means; means for connecting a transmission line between said radiating elements; and said solid dielectric means having a propagation wave velocity substantially less than that of free space and providing a resonant load coupled to a free end of said first one of said radiating elements when said first one of said radiating elements is radiating into a medium having a propagation velocity substantially less than that of free space. - View Dependent Claims (16, 17, 18, 19)
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20. A subsurface radiating system comprising:
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a dipole antenna having first and second radiating elements radiating into a subsurface body of oil shale; each of said elements having a conductive portion forming a portion of a cavity substantially filled with a solid dielectric; a transmission line electrically connected between the midpoint of said dipole antenna and an inner and outer conductor of said transmission line; and said transmission line being surrounded by said solid dielectric within said cavity portion of said first one of said radiating elements of said dipole antenna. - View Dependent Claims (21, 22, 23)
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Specification